function add(num1, num2) {
	var r1, r2, m, n;
	try {
		r1 = num1.toString().split(".")[1].length
	} catch(e) {
		r1 = 0
	}
	try {
		r2 = num2.toString().split(".")[1].length
	} catch(e) {
		r2 = 0
	}
	m = Math.pow(10, Math.max(r1, r2));
	n = (r1 >= r2) ? r1 : r2;
	return((num1 * m + num2 * m) / m).toFixed(n);
}

function sub(num1, num2) {
	var r1, r2, m, n;
	try {
		r1 = num1.toString().split(".")[1].length
	} catch(e) {
		r1 = 0
	}
	try {
		r2 = num2.toString().split(".")[1].length
	} catch(e) {
		r2 = 0
	}
	n = (r1 >= r2) ? r1 : r2;
	m = Math.pow(10, Math.max(r1, r2));
	return((num1 * m - num2 * m) / m).toFixed(n);
}

function mul(num1, num2) {
	var m = 0;
	try {
		m += num1.toString().split(".")[1].length
	} catch(e) {}
	try {
		m += num2.toString().split(".")[1].length
	} catch(e) {}
	return(Number(num1.toString().replace(".", "")) * Number(num2.toString().replace(".", ""))) / Math.pow(10, m)
}

function div(arg1, arg2) {
	var t1 = 0,
		t2 = 0,
		r1, r2;
	try {
		t1 = arg1.toString().split(".")[1].length
	} catch(e) {}
	try {
		t2 = arg2.toString().split(".")[1].length
	} catch(e) {}
	r1 = Number(arg1.toString().replace(".", ""));
	r2 = Number(arg2.toString().replace(".", ""));
	return(r1 / r2) * Math.pow(10, t2 - t1);
}